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diff --git a/3673/CH9/EX9.a.13/Example_a_9_13.sce b/3673/CH9/EX9.a.13/Example_a_9_13.sce
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+//Example_a_9_13 page no:414
+clc;
+//equation with unknown variable cannot be solved in scilab therefore taking the simplified equation
+E1=124.52-(%i*165.08);
+E2=1.5-(%i*0.866);
+V=E1/E2;
+Vromag=100;
+Vroang=-10;
+Vroreal=Vromag*cosd(Vroang);
+Vroimag=Vromag*sind(Vroang);
+Vro=Vroreal+(%i*Vroimag);
+Vo_o=V-Vro;
+Vo_omag=sqrt(real(Vo_o)^2+imag(Vo_o)^2);
+Vo_oang=atand(imag(Vo_o)/real(Vo_o));
+disp(Vo_omag,"the magnitude of voltage between O"'O is (in V)");
+disp(Vo_oang,"the angle of voltage between O"'O is (in degree)");